package edu.sctu.lab03.util;

import edu.sctu.lab03.model.User;

import java.sql.*;
import java.util.ArrayList;
import java.util.List;

public class DataBase {

    /**
     * 获取用户列表信息
     * @return
     */
    public List<User> getUserList() {

        List<User> userList = new ArrayList<User>();
        Connection connection = null;
        Statement statement = null;
        ResultSet resultSet = null;

        //3+1
        try {
            Class.forName("com.mysql.jdbc.Driver");

            String sql = "select * from t_users";

            connection = DriverManager.getConnection(
                    "jdbc:mysql://localhost:3306/sctu_javaweb_2018?serverTimezone=UTC",
                    "root",
                    "123456"
            );

            statement = connection.createStatement();
            resultSet = statement.executeQuery(sql);

            while (resultSet.next()) {
                int id = resultSet.getInt(1);
                String name = resultSet.getString(2);
                String password = resultSet.getString(3);

                //封装在User中
                User user = new User();
                user.setId(id);
                user.setName(name);
                user.setPassword(password);

                userList.add(user);

            }
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }finally {
            //关闭
            try {
                resultSet.close();
                statement.close();
                connection.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }


        }
return userList;
    }

    /**
     * 其他方法
     */
}
